Hi Quasin, Neel, Ali, Albin,
(I'll reply in everybody in one mail, this list is busy enough as it is
:-) )
Ali, Neel,
Thanks for the link.
Also I agree that basic-information is important to get started, in this
case, I was looking for a forum/list. Sometimes, one needs to have a
place to just as a question on a particular issue or how it is
implemented in a specific project.
In this case, my question was related to a APT decoder found here
(http://oz9aec.net/radios/gnu-radio/simple-apt-decoder-prototype), and
more specific how the AM demodulation is done. It uses a trick to shift
the spectrum of a IQ signal down by 1/4 the sampling-rate, but I did not
understand why he does one single conversion from 2 floats to a complex
(s1, s2 -> [s1,s2]). and not two (s1,s2,s3,s4 -> [s1,s2],[-s3,-s4])
In the mean time, I found it out myself: as the next block is a
complex-to-amplitude, the sign of the complex number is removed anyway.
I don(t know if this the same for other people new to signal-processing,
GNU Radio is very interesting as it allows me to look at how other
people do it and learn from that. Hence, having a forum to ask questions
is a real forum.
Albin, Quasim,
Thanks for the link.
The "dsprelated" forum seams quite interesting.
The problem with stack-exchange (I have noticed) is that you really must
have a very specific answer with a very specific answer. They do not
like "generic" questions. (I once had a question on amateur-radio
refused by them as it was "not precise enough").
Thanks!
Kristoff
On 18/03/19 00:55, Qasim Chaudhari wrote:
Hi Kristoff,
Since you've asked about a forum, I think DSPrelated is a treasure
trove of DSP knowledge. Hope you find it useful.
https://www.dsprelated.com/forums
Cheers,
Qasim
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